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A 0.6-V Delta–Sigma Modulator With Subthreshold-Leakage Suppression Switches

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6 Author(s)
Hyungdong Roh ; Dept. of Electr. Eng., Hanyang Univ., Ansan, South Korea ; Hyoungjoong Kim ; Youngkil Choi ; Jeongjin Roh
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A 0.6-V 34-muW delta-sigma modulator implemented by using a standard 0.13-mum complementary metal-oxide-semiconductor technology is presented. This brief analyzes a subthreshold-leakage current problem in switched-capacitor circuits and proposes subthreshold-leakage suppression switches to solve the problem. To verify the operation of the subthreshold-leakage suppression switches, two different fifth-order delta-sigma modulators are implemented with conventional switches and new switches. The input feedforward architecture is used to reduce the voltage swings of the integrators. A high-performance low-quiescent amplifier architecture is developed for the modulator. The modulator, with new switches, achieves a dynamic range of 83 dB, a peak signal-to-noise ratio of 82 dB, and a peak signal-to-noise-plus-distortion ratio of 81 dB in a signal bandwidth of 20 kHz. The power consumption is 34 muW for the modulator, and the core chip size is 0.33 mm2 .

Published in:

Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:56 ,  Issue: 11 )

Date of Publication:

Nov. 2009

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